Answer.

Did Maria lie in the conversation she had with the boutique about her stockings? In our first lecture in the lab, we did a lot of tests, and one of them was shrinkage. I had to see if Maria was telling the truth or not. Before we did the test, we measured a piece of the stockings before we put it in the washing machine. We chose to wash it in the machine because that is probably the way Maria would have done it. In the washing machine we also had to put other textiles as well, because the washing process was supposed to be as realistic as possible. Because we are doing tests on to of our products, stockings and the pair of jeans, we put our sample for the jeans in the machine as well. 

Washing - 2kg

When the washing machine was finished, we put our samples in the tumble dryer to see if they could bear the hole process. The last thing to do in the process was measuring both of the samples. This is our results:

The chart shows us that the stockings shrunk 9,5% in the length which is not enough to call the boutique. She is still able to use it, because the elastane will expand. If she do not tumble dry it, she save the fibers for abrasion. In the end, the shrinkage of Maria's stockings are not a good enough reason to complain and the spot of bolognese is her own fault. She probably has to buy a new pair of stockings if she wants a clean pair.